import httpx
import pytest

from opengoods.adapters.openfoodfacts import OpenFoodFactsAdapter


def _adapter(handler, **kwargs):
    client = httpx.Client(transport=httpx.MockTransport(handler))
    return OpenFoodFactsAdapter(client=client, min_interval=0, backoff_base=0, **kwargs)


def test_retries_transient_5xx_then_succeeds():
    calls = {"n": 0}

    def handler(request: httpx.Request) -> httpx.Response:
        calls["n"] += 1
        if calls["n"] < 3:
            return httpx.Response(503)
        return httpx.Response(200, json={"status": 1, "product": {"code": "x"}})

    adapter = _adapter(handler, max_retries=4)
    assert adapter.fetch_barcode("x") == {"code": "x"}
    assert calls["n"] == 3  # two 503s retried, third succeeds


def test_retries_exhausted_raises():
    def handler(request: httpx.Request) -> httpx.Response:
        return httpx.Response(503)

    adapter = _adapter(handler, max_retries=2)
    with pytest.raises(httpx.HTTPStatusError):
        adapter.fetch_barcode("x")


def test_non_retryable_4xx_not_retried():
    calls = {"n": 0}

    def handler(request: httpx.Request) -> httpx.Response:
        calls["n"] += 1
        return httpx.Response(404)

    adapter = _adapter(handler, max_retries=4)
    with pytest.raises(httpx.HTTPStatusError):
        adapter.fetch_barcode("x")
    assert calls["n"] == 1  # 404 is not retried


def test_retries_connection_error_then_succeeds():
    calls = {"n": 0}

    def handler(request: httpx.Request) -> httpx.Response:
        calls["n"] += 1
        if calls["n"] == 1:
            raise httpx.ConnectError("boom")
        return httpx.Response(200, json={"status": 1, "product": {"code": "y"}})

    adapter = _adapter(handler, max_retries=4)
    assert adapter.fetch_barcode("y") == {"code": "y"}
    assert calls["n"] == 2